| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| # |
| |
| from concurrent import futures |
| from typing import List |
| |
| import grpc |
| |
| from friendship_pb2 import Person, CreateResult, PersonEmail, CommonFriendsResult, FriendshipResponse |
| from friendship_pb2_grpc import FriendshipServicer, add_FriendshipServicer_to_server |
| |
| |
| class FriendShipService(FriendshipServicer): |
| """ |
| Implementation of the gRPC FriendshipServicer. |
| See the friendship.proto definition for more info. |
| """ |
| |
| def __init__(self): |
| self.people = list() |
| |
| def Create(self, request, context): |
| person = request # type: Person |
| res = CreateResult() # type: CreateResult |
| if person.email in [p.email for p in self.people]: |
| res.success = False |
| res.message = "Person already exists (email: %s)" % person.email |
| return res |
| |
| self.people.append(person) |
| res.success = True |
| return res |
| |
| def ListFriends(self, request, context): |
| pe = request # type: PersonEmail |
| for p in self.people: |
| if pe.email in p.email: |
| for friend in p.friends: |
| yield self.get_person(friend) |
| |
| def CommonFriendsCount(self, request_iterator, context): |
| res = CommonFriendsResult() |
| fs = set([p.email for p in self.people]) |
| for pe in request_iterator: |
| common_friends = [p.email for p in self.people if pe.email in p.friends] |
| fs.intersection_update(common_friends) |
| res.friends.extend(fs) |
| res.count = len(res.friends) |
| return res |
| |
| def MakeFriends(self, request_iterator, context): |
| for fr in request_iterator: |
| res = FriendshipResponse() |
| try: |
| p1 = self.get_person(fr.email1) |
| p2 = self.get_person(fr.email2) |
| if None in [res.friend1, res.friend2]: |
| res.error = "Invalid email provided" |
| else: |
| if fr.email2 not in p1.friends: |
| p1.friends.append(fr.email2) |
| if fr.email1 not in p2.friends: |
| p2.friends.append(fr.email1) |
| res.friend1.CopyFrom(p1) |
| res.friend2.CopyFrom(p2) |
| except Exception as e: |
| res.error = e.__str__() |
| finally: |
| yield res |
| |
| def get_person(self, email): |
| for p in self.people: |
| if p.email == email: |
| return p |
| return None |
| |
| |
| def serve(port): |
| server = grpc.server(futures.ThreadPoolExecutor(max_workers=1)) |
| add_FriendshipServicer_to_server(FriendShipService(), server) |
| server.add_insecure_port('[::]:%s' % port) |
| server.start() |
| return server |